UPVC Sash windows

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Does anyone have any recommendations for a good company for UPVC sash windows?
We have a semi on a busy road, in London, we need to replace all of the windows about 15, but unfortunately we can’t afford double glazed timber.
We had a terrible time with door suppliers in our last house, so really want to use a good company this time.
Any hints and tips would be great. Thanks

I feel your pain. We need to do about 12 windows and have decided to do wooden double glazed sash windows, as and when we can afford them.

Doing four this year and it's emptied out my savings account...

Sorry, forgot the recommendation. We used this company last year for wooden double glazed French windows and they were excellent. They were recommended by friends who used them for UPVC double glazing. grabex.co.uk/

OP - where in London are you based if you don’t mind sharing ? We are in SE London and used a window fitter local to us (literally 15 min walk away), and they were fab. Have since used them multiple times as we’ve replaced windows in stages and done a loft extension.